From mboxrd@z Thu Jan 1 00:00:00 1970 From: Imre Deak Subject: Re: [PATCH 1/2] drm/i915/bxt: work around HW coherency issue when accessing GPU seqno Date: Wed, 10 Jun 2015 13:59:33 +0300 Message-ID: <1433933973.25216.48.camel@intel.com> References: <1433780924-7673-1-git-send-email-imre.deak@intel.com> <1433780924-7673-2-git-send-email-imre.deak@intel.com> <5575CBF0.5090109@intel.com> <20150608171247.GD11457@nuc-i3427.alporthouse.com> <20150608173451.GF5176@intel.com> <20150608180049.GK11457@nuc-i3427.alporthouse.com> <20150608184002.GG5176@intel.com> <5575EDF9.9070303@intel.com> Reply-To: imre.deak@intel.com Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by gabe.freedesktop.org (Postfix) with ESMTP id 48B656E894 for ; Wed, 10 Jun 2015 03:59:37 -0700 (PDT) In-Reply-To: <5575EDF9.9070303@intel.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" To: Dave Gordon Cc: intel-gfx@lists.freedesktop.org List-Id: intel-gfx@lists.freedesktop.org T24gbWEsIDIwMTUtMDYtMDggYXQgMjA6MzMgKzAxMDAsIERhdmUgR29yZG9uIHdyb3RlOgo+IE9u IDA4LzA2LzE1IDE5OjQwLCBWaWxsZSBTeXJqw6Rsw6Qgd3JvdGU6Cj4gPiBPbiBNb24sIEp1biAw OCwgMjAxNSBhdCAwNzowMDo0OVBNICswMTAwLCBDaHJpcyBXaWxzb24gd3JvdGU6Cj4gPj4gT24g TW9uLCBKdW4gMDgsIDIwMTUgYXQgMDg6MzQ6NTFQTSArMDMwMCwgVmlsbGUgU3lyasOkbMOkIHdy b3RlOgo+ID4+PiBPbiBNb24sIEp1biAwOCwgMjAxNSBhdCAwNjoxMjo0N1BNICswMTAwLCBDaHJp cyBXaWxzb24gd3JvdGU6Cj4gPj4+PiBPbiBNb24sIEp1biAwOCwgMjAxNSBhdCAwNjowODowMFBN ICswMTAwLCBEYXZlIEdvcmRvbiB3cm90ZToKPiA+Pj4+PiBPbiAwOC8wNi8xNSAxNzoyOCwgSW1y ZSBEZWFrIHdyb3RlOgo+ID4+Pj4+PiBCeSBydW5uaW5nIGlndC9zdG9yZV9kd29yZF9sb29wX3Jl bmRlciBvbiBCWFQgd2UgY2FuIGhpdCBhIGNvaGVyZW5jeQo+ID4+Pj4+PiBwcm9ibGVtIHdoZXJl IHRoZSBzZXFubyB3cml0dGVuIGF0IEdQVSBjb21tYW5kIGNvbXBsZXRpb24gdGltZSBpcyBub3QK PiA+Pj4+Pj4gc2VlbiBieSB0aGUgQ1BVLiBUaGlzIHJlc3VsdHMgaW4gX19pOTE1X3dhaXRfcmVx dWVzdCBzZWVpbmcgdGhlIHN0YWxlCj4gPj4+Pj4+IHNlcW5vIGFuZCBub3QgY29tcGxldGluZyB0 aGUgcmVxdWVzdCAobm90IGNvbnNpZGVyaW5nIHRoZSBsb3N0Cj4gPj4+Pj4+IGludGVycnVwdC9H UFUgcmVzZXQgbWVjaGFuaXNtKS4gSSBhbHNvIHZlcmlmaWVkIHRoYXQgdGhpcyBpc24ndCBhIGNh c2UKPiA+Pj4+Pj4gb2YgYSBsb3N0IGludGVycnVwdCwgb3IgdGhhdCB0aGUgY29tbWFuZCBkaWRu J3QgY29tcGxldGUgc29tZWhvdzogd2hlbgo+ID4+Pj4+PiB0aGUgY29oZXJlbmN5IGlzc3VlIG9j Y3VyZWQgSSByZWFkIHRoZSBzZXFubyB2aWEgYW4gdW5jYWNoZWQgR1RUIG1hcHBpbmcKPiA+Pj4+ Pj4gdG9vLiBXaGlsZSB0aGUgY2FjaGVkIHZlcnNpb24gb2YgdGhlIHNlcW5vIHN0aWxsIHNob3dl ZCB0aGUgc3RhbGUgdmFsdWUKPiA+Pj4+Pj4gdGhlIG9uZSByZWFkIHZpYSB0aGUgdW5jYWNoZWQg bWFwcGluZyB3YXMgdGhlIGNvcnJlY3Qgb25lLgo+ID4+Pj4+Pgo+ID4+Pj4+PiBXb3JrIGFyb3Vu ZCB0aGlzIGlzc3VlIGJ5IGNsZmx1c2hpbmcgdGhlIGNvcnJlc3BvbmRpbmcgQ1BVIGNhY2hlbGlu ZQo+ID4+Pj4+PiBmb2xsb3dpbmcgYW55IHN0b3JlIG9mIHRoZSBzZXFubyBhbmQgcHJlY2VkaW5n IGFueSByZWFkaW5nIG9mIGl0LiBXaGVuCj4gPj4+Pj4+IHJlYWRpbmcgaXQgZG8gdGhpcyBvbmx5 IHdoZW4gdGhlIGNhbGxlciBleHBlY3RzIGEgY29oZXJlbnQgdmlldy4KPiA+Pj4+Pj4KPiA+Pj4+ Pj4gVGVzdGNhc2U6IGlndC9zdG9yZV9kd29yZF9sb29wX3JlbmRlcgo+ID4+Pj4+PiBTaWduZWQt b2ZmLWJ5OiBJbXJlIERlYWsgPGltcmUuZGVha0BpbnRlbC5jb20+Cj4gPj4+Pj4KPiA+Pj4+PiBO b3QgbmVjZXNzYXJpbHkgYSBjdXJlIGZvciB0aGlzLCBidXQgQlNwZWMgc2F5cyBvZiBNSV9TVE9S RV9EQVRBX0lNTQo+ID4+Pj4+IChhbmQgTUlfU1RPUkVfREFUQV9JTkRFWCk6Cj4gPj4+Pj4KPiA+ Pj4+PiAJVGhpcyBjb21tYW5kIHNpbXBseSBpbml0aWF0ZXMgdGhlIHdyaXRlIG9wZXJhdGlvbiB3 aXRoCj4gPj4+Pj4gCWNvbW1hbmQgZXhlY3V0aW9uIHByb2NlZWRpbmcgbm9ybWFsbHkuIEFsdGhv dWdoIHRoZSB3cml0ZQo+ID4+Pj4+IAlvcGVyYXRpb24gaXMgZ3VhcmFudGVlZCB0byBjb21wbGV0 ZSAiZXZlbnR1YWxseSIsIHRoZXJlIGlzCj4gPj4+Pj4gCW5vIG1lY2hhbmlzbSB0byBzeW5jaHJv bml6ZSBjb21tYW5kIGV4ZWN1dGlvbiB3aXRoIHRoZQo+ID4+Pj4+IAljb21wbGV0aW9uIChvciBl dmVuIGluaXRpYXRpb24pIG9mIHRoZXNlIG9wZXJhdGlvbnMuCj4gPj4+Pj4KPiA+Pj4+PiBTbyBz aG91bGRuJ3Qgd2UgdXNlIE1JX0ZMVVNIX0RXIG9yIFBJUEVfQ09OVFJPTCB0byB1cGRhdGUgdGhl IHNlcW5vIGluCj4gPj4+Pj4gdGhlIEhXU1AgaW5zdGVhZD8KPiA+Pj4+Cj4gPj4+PiBpaXJjIHRo ZXJlIGlzIGFsc28gbm8gZ3VhcnJhbnRlZSBmb3Igd2hlbiB0aGUgcG9zdC1zeW5jIHdyaXRlIG9w IGlzCj4gPj4+PiBjb21wbGV0ZWQgZm9yIGEgRkxVU0hfRFcvUElQRV9DT05UUk9MIGVpdGhlci4g SSdkIGJlIGhhcHB5IHRvIGJlCj4gPj4+PiBjb3JyZWN0ZWQhCj4gPj4+Cj4gPj4+IE15IHJlYWRp bmcgb2YgdGhlIHNwZWMgc3VnZ2VzdHMgdGhhdCBzb21ldGhpbmcgbGlrZSB0aGlzIGNvdWxkIHdv cms6Cj4gPj4+IFBJUEVfQ09OVFJPTCB3LyBQSVBFX0NPTlRST0xfUVdfV1JJVEUKPiA+Pj4gUElQ RV9DT05UUk9MIHcvIFBJUEVfQ09OVFJPTF9OT1RJRlkgfCBQSVBFX0NPTlRST0xfRkxVU0hfRU5B QkxFCj4gPj4KPiA+PiBBYnNvbHV0ZWx5IHN1cmU/IFRoZSBpc3N1ZSBpcyBub3QgdGhlIGNvbXBs ZXRpb24gb2YgdGhlIFBJUEVfQ09OVFJPTCwKPiA+PiBidXQgb2YgZW5zdXJlIHRoYXQgdGhlIHZh bHVlIGhhcyBiZWVuIHdyaXR0ZW4gdG8gbWVtb3J5IGFuZCB0aGUgQ1BVCj4gPj4gY2FjaGUgc25v b3BlZC4gSSBkb24ndCByZW1lbWJlciB0aGVyZSBiZWluZyBhbnl0aGluZyBhcyBjbGVhciBhcyB0 aGUKPiA+PiBnZW4yLTUgc3RhdGVtZW50IHRoYXQgYWxsIHdyaXRlcyBhcmUgY29oZXJlbnQgYmVm b3JlIHRoZSBpbnRlcnJ1cHQgaXMKPiA+PiByYWlzZWQuCj4gPj4KPiA+PiBXZSBjYW4gaGl0IHRo ZSBpc3N1ZSB0aGF0IHRoZSBzZXFubyB3cml0ZXMgYXJlbid0IGNvaGVyZW50IGJlZm9yZSB0aGUK PiA+PiBpbnRlcnJ1cHQgd2l0aCBvdXIgY3VycmVudCBtZXRob2QgLSBJIGhhdmUgc2VlbiBpdCB3 aXRoIGhzdywgc28gdGhpcyBpcwo+ID4+IGRlZmluaXRlbHkgc29tZXRoaW5nIHdvcnRoIGltcHJv dmluZy4KPiA+IAo+ID4gV2hhdCBJIGdldCBmcm9tIHRoZSBzcGVjIGlzOgo+ID4gLSBUaGUgcG9z dC1zeW5jIG9wZXJhdGlvbiBpcyBzdGFydGVkIGFmdGVyIHByZXZpb3VzIGFuZCBjdXJyZW50IGZs dXNoZXMKPiA+ICAgaGF2ZSBjb21wbGV0ZWQKPiA+IC0gVGhlIGZsdXNoIGVuYWJsZSBiaXQgY2F1 c2VzIHRoZSBDUyB0byB3YWl0IHVudGlsIGFsbCBwcmV2aW91cwo+ID4gICBwb3N0LXN5bmMgb3Bl cmF0aW9ucyBoYXZlIGNvbXBsZXRlZCwgd2hpY2ggaG9wZWZ1bGx5IG1lYW5zIHRoZQo+ID4gICBz dG9yZSBpcyB2aXNpYmxlIHRvIGV2ZXJ5b25lCj4gPiAtIFRoZSBub3RpZnkgaW50ZXJydXB0IGlz IHNpZ25hbGxlZCBhZnRlciB0aGUgY3VycmVudCBzeW5jIG9wZXJhdGlvbgo+ID4gICBoYXMgY29t cGxldGVkLCB3aGljaCBJIGhvcGUgbWVhbnMgdGhlIGZsdXNoIGVuYWJsZSBzdGFsbCBoYXMgYWxz bwo+ID4gICBmaW5pc2hlZCAoYW5kIGlmIG5vdCBhIHRocmVlIFBJUEVfQ09OVFJPTCBzZXFlbmNl IGNvdWxkIGJlIHVzZWQKPiA+ICAgaW5zdGVhZCkKPiA+IAo+ID4gU28gbm8sIEknbSBub3QgYWJz b2x1dGVseSBzdXJlIGJ5IGFueSBtZWFucy4KPiAKPiBIZXJlJ3MgdGhlIGNvbW1lbnRhcnkgZm9y IE1JX0ZMVVNIX0RXOgo+IAo+IAlUaGUgTUlfRkxVU0hfRFcgY29tbWFuZCBpcyB1c2VkIHRvIHBl cmZvcm0gYW4gaW50ZXJuYWwgImZsdXNoIgo+IAlvcGVyYXRpb24uIFRoZSBwYXJzZXIgcGF1c2Vz IG9uIGFuIGludGVybmFsIGZsdXNoIHVudGlsIGFsbAo+IAlkcmF3aW5nIGVuZ2luZXMgaGF2ZSBj b21wbGV0ZWQgYW55IHBlbmRpbmcgb3BlcmF0aW9ucy4gSW4KPiAJYWRkaXRpb24sIHRoaXMgY29t bWFuZCBjYW4gYWxzbyBiZSB1c2VkIHRvOiBGbHVzaCBhbnkgZGlydHkKPiAJZGF0YSB0byBtZW1v cnkuIEludmFsaWRhdGUgdGhlIFRMQiBjYWNoZSBpbnNpZGUgdGhlIGhhcmR3YXJlCj4gCj4gCVVz YWdlIG5vdGU6IEFmdGVyIHRoaXMgY29tbWFuZCBpcyBjb21wbGV0ZWQgd2l0aCBhIFN0b3JlIERX b3JkCj4gCWVuYWJsZWQsIENQVSBhY2Nlc3MgdG8gZ3JhcGhpY3MgbWVtb3J5IHdpbGwgYmUgY29o ZXJlbnQKPiAJKGFzc3VtaW5nIHRoZSBSZW5kZXIgQ2FjaGUgZmx1c2ggaXMgbm90IGluaGliaXRl ZCkuCj4gCj4gCS4uLgo+IAo+IAlOT1RJRlk6IElmIEVOQUJMRUQsIGEgU3luYyBDb21wbGV0aW9u IEludGVycnVwdCB3aWxsIGJlCj4gCWdlbmVyYXRlZCAoaWYgZW5hYmxlZCBieSB0aGUgTUkgSW50 ZXJydXB0IENvbnRyb2wgcmVnaXN0ZXJzKQo+IAlvbmNlIHRoZSBzeW5jIG9wZXJhdGlvbiBpcyBj b21wbGV0ZS4gU2VlIEludGVycnVwdCBDb250cm9sCj4gCVJlZ2lzdGVycyBpbiBNZW1vcnkgSW50 ZXJmYWNlIFJlZ2lzdGVycyBmb3IgZGV0YWlscy4KPiAKPiBTbyB0aGF0J3MgbGlrZXdpc2UgdW5j bGVhciBhYm91dCB3aGV0aGVyIHRoZSBpbnRlcnJ1cHQgY29tZXMgYWZ0ZXIganVzdAo+IHRoZSAi c3luYyIgb3IgYWZ0ZXIgdGhlICJwb3N0IHN5bmMgb3BlcmF0aW9uIiBhcyB3ZWxsLgo+IAo+IFRo ZW4gdGhlcmUncyB0aGUgRENfRkxVU0ggYml0IGluIHRoZSBQSVBFX0NPTlRST0wgaW5zdHJ1Y3Rp b246Cj4gCj4gCURDIEZsdXNoIChMMyBGbHVzaCkgYnkgZGVmYXVsdCBkb2VzbuKAmXQgcmVzdWx0 IGluCj4gCWZsdXNoaW5nL2ludmFsaWRhdGluZyB0aGUgSUEgQ29oZXJlbnQgbGluZXMgZnJvbSBM MyQsIGhvd2V2ZXIKPiAJdGhpcyBjYW4gYmUgYWNoaWV2ZWQgYnkgc2V0dGluZyBjb250cm9sIGJp dCDigJxQaXBlIGxpbmUgZmx1c2gKPiAJQ29oZXJlbnQgbGluZXPigJ0gaW4g4oCcTDNTUUNSRUc0 4oCdIHJlZ2lzdGVyLgoKSSB0aGluayB0aGUgZGlzY3Vzc2lvbiBoZXJlIGlzIGFib3V0IHR3byBz ZXBhcmF0ZSB0aGluZ3M6CjEuIFBvc3NpYmxlIG9yZGVyaW5nIGlzc3VlIGJldHdlZW4gdGhlIHNl cW5vIHN0b3JlIGFuZCB0aGUgY29tcGxldGlvbgppbnRlcnJ1cHQKMi4gQ29oZXJlbmN5IGlzc3Vl IHRoYXQgbGVhdmVzIHRoZSBDUFUgd2l0aCBhIHN0YWxlIHZpZXcgb2YgdGhlIHNlcW5vCmluZGVm aW5pdGVseSwgd2hpY2ggdGhpcyBwYXRjaCB3b3JrcyBhcm91bmQKCkknbSBjb25maWRlbnQgdGhh dCBpbiBteSBjYXNlIHRoZSBwcm9ibGVtIGlzIG5vdCBkdWUgdG8gb3JkZXJpbmcuIElmIGl0Cndh cyAib25seSIgb3JkZXJpbmcgdGhlbiB0aGUgdmFsdWUgd291bGQgc2hvdyB1cCBldmVudHVhbGx5 LiBUaGlzIGlzIG5vdAp0aGUgY2FzZSB0aG91Z2gsIF9fd2FpdF9mb3JfcmVxdWVzdCB3aWxsIHNl ZSB0aGUgc3RhbGUgdmFsdWUKaW5kZWZpbml0ZWx5IGV2ZW4gdGhvdWdoIGl0IGdldHMgd29rZW4g dXAgcGVyaW9kaWNhbGx5IGFmdGVyd2FyZHMgYnkgdGhlCmxvc3QgSVJRIGxvZ2ljICh3aXRoIGhh bmdjaGVjayBkaXNhYmxlZCkuCgpJIGhhdmUgdHJpZWQgdG8gcmVwbGFjZSB0aGUgTUlfU1RPUkVf TUVNT1JZX0lNTStNSV9VU0VSX0lOVEVSUlVQVCBvbiB0aGUKcmVuZGVyIHJpbmcgd2l0aCBhIHNp bmdsZSBQSVBFX0NPTlRST0wgdG8gc3RvcmUgdGhlIHNlcW5vIGFuZCBzZW5kIGEKbm90aWZ5IGlu dGVycnVwdCwgc2V0dGluZyB0aGUgQ1NfU1RBTEwsIFBJUEVfQ09OVFJPTF9GTFVTSF9FTkFCTEUs CkRDX0ZMVVNIX0VOQUJMRSBiaXRzLiBUaGlzIGRpZG4ndCBnZXQgcmlkIG9mIHRoZSBwcm9ibGVt LCBJIGhhZCB0aGUgc2FtZQpiZWhhdmlvciBhcyBiZWZvcmUuIEkgYWxzbyB0cmllZCBzZXR0aW5n IEwzU1FDUkVHNCBiaXQgMjEgYXMgeW91CnN1Z2dlc3RlZCwgYnV0IGl0IGRpZG4ndCBoYXZlIGFu IGVmZmVjdC4KClNpbWlsYXJseSBJIHRyaWVkIG5vdyB0byByZXBsYWNlIHRoZSBNSV9TVE9SRV9N RU1PUllfSU1NCitNSV9VU0VSX0lOVEVSUlVQVCBvbiB0aGUgQlNEL0JMVC9WRUJPWCByaW5ncyB3 aXRoIGEgTUlfRkxVU0hfRFcgc3RvcmluZwp0aGUgc2Vxbm8gYW5kIHNlbmRpbmcgYSBzeW5jIGlu dGVycnVwdC4gQXMgYWJvdmUsIHRoaXMgZGlkbid0IHNvbHZlIHRoZQpwcm9ibGVtLgoKSSB3b25k ZXIgaWYgc3RvcmVzIGJ5IE1JX1NUT1JFX01FTU9SWV9JTU0gZXZlbiBnbyB0aHJvdWdoIHRoZSBM MyQuCkFjY29yZGluZyB0byBWaWxsZSB0aGV5IGFyZSBub3QgYW5kIHNvIEknbSBub3Qgc3VyZSBo b3cgdGhlIGFib3ZlIGZsdXNoCm9wZXJhdGlvbnMgd291bGQgc29sdmUgdGhpcyBwcm9ibGVtLgoK PiBBbmQgaXMgdGhlIEdQVSdzIE1JX0NMRkxVU0ggaW5zdHJ1Y3Rpb24gb2YgYW55IHVzZT8KCkFj Y29yZGluZyB0byB0aGUgc3BlYyB0aGlzIGNvbW1hbmQgaXMgUkNTIHNwZWNpZmljLCBzbyBpdCB3 b3VsZG4ndCBoZWxwCmluIGNhc2Ugb2YgdGhlIG90aGVyIHJpbmdzICh3aGVyZSBJIGFsc28gc2Vl IHRoaXMgcHJvYmxlbSB3aXRob3V0IHRoaXMKcGF0Y2gpLgoKLS1JbXJlCgpfX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fXwpJbnRlbC1nZnggbWFpbGluZyBsaXN0 CkludGVsLWdmeEBsaXN0cy5mcmVlZGVza3RvcC5vcmcKaHR0cDovL2xpc3RzLmZyZWVkZXNrdG9w Lm9yZy9tYWlsbWFuL2xpc3RpbmZvL2ludGVsLWdmeAo=